Design and verification of adaptive control to generate flat-top radio frequency power output of pulse compressor for SXFEL
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作者
Xu, Yiming; Zhang, Junqiang; Xiao, Chengcheng; Fang, Wencheng; Zhao, Zhentang
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刊物名称
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
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年、卷、文献号
2022, 1031, 0168-9002
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关键词
Xu, Yiming; Zhang, Junqiang; Xiao, Chengcheng; Fang, Wencheng; Zhao, Zhentang
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摘要
The adaptive control-based low-level radio frequency (LLRF) algorithm was developed for the two-bunch operation of the Shanghai Soft-X-ray Free Electron Laser Facility (SXFEL), needing to generate flat-top radio frequency (RF) power pulses at the output of an RF pulse compressor. The adaptive algorithm optimized for the compressor system can achieve a better convergence rate and domain. The algorithm has already modulated the flat-top-accelerating gradient in the SXFEL's RF cavity, and the energy of the electrons accelerated at the field's different longitudinal locations is within 0.8% (rms) of the mean value. This study presents the algorithm's theory, experimental setup, test results before and after the improvement, and the distortion of the measured waveform due to the transmission delay. Finally, the adaptive control algorithm-based LLRF system is installed at SXFEL and numerous results, including RF pulse stability and beam stability, are presented.
